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        In this expansion (x-1)(x-2)(x-3)..........(x-18), the coefficient of x^17
3 years ago

jagdish singh singh
173 Points
							$\hspace{-0.70 cm} writting (x-1)(x-2)(x-3)\cdots \cdots (x-18)\\\\\\ =x^{18}+(1+2+3+\cdots+18)x^{17}+(1\cdot2 +1\cdot 3+\cdots )x^{16}\\\\\\ So Coeff. of x^{17} = (1+2+3+\cdots +18)=\frac{1}{2}(18)(19) = 9\cdot 19$

3 years ago
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• 101 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions